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Old 04-24-2011, 11:11 AM   #1
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oil on my air filter???

I can see where its coming from, but I don't understand why. I want to call it a PVC valve, but it doesn't look like one. It comes out of the valve cover and is the one closer to the front of the jeep...its a 4.0L, is it supposed to be pushing oil into the filter or is there something wrong? and its not a lot of oil but more of a residue seepage.

The other thing was, someone told me that I had to much black carbon in my exhaust pipe... after politely asking him to keep his nose out of my exhaust , it got me thinking, I never paid attention to my exhaust on any vehicle I have owned, only on whether there was blue or black pouring out... this is not the case with my YJ.

Thanks for reading and responding.
EP

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Old 04-24-2011, 11:14 AM   #2
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I have had both of those issues.. I replaced the 'PCV' valves and it has not done it since.. As for the black tip on my exhaust I have not figured out what is causing that or how to fix it just yet.

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Old 04-24-2011, 11:15 AM   #3
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Common issue, on my XJ I pulled the tube from the intake and got one of those ricer breather filters and out that on the valve cover. No more oil in my air filter and it was a simple fix for a rig that i didn't drive much and was selling.
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Old 04-24-2011, 11:34 AM   #4
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Could be something wrong with the breather lines coming off from your valve cover. The only way oil can really get into the cylinders is through the bottom (oil ring/compression rings are bad on the piston) or through the top of the head, like the intake/exhaust valves are not closing correctly. Easy fixes either way.

If replacing some of the breathing units on your valve cover don't fix the problem, I would certainly look into the piston/valve problem.

Google "Engine blow by"
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Old 04-28-2011, 01:29 PM   #5
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The black on your exhaust pipe could be caused by the engine running to rich. One common cause for this is a cracked exhaust manifold (header). this let more air into the exhaust and tricks the oxygen sensor into thinking the engine is running lean.
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Old 04-28-2011, 11:26 PM   #6
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Quote:
Originally Posted by dvcopen View Post
The black on your exhaust pipe could be caused by the engine running to rich. One common cause for this is a cracked exhaust manifold (header). this let more air into the exhaust and tricks the oxygen sensor into thinking the engine is running lean.
X2, Look at where all the pipes are coming down and meeting in your exhaust manifold. Common problem. Mine had a few cracks and could tell by the black lines. Went to a you pull it yard and got a better one and threw on some extra metal by welding to build up those areas. Alot less blowby now and even got some extra power.

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